community[minor]: OpenAPI agent. Add support for PUT, DELETE and PATCH (#22962)

**Description**: Add PUT, DELETE and PATCH tools to tool list for
OpenAPI agent if dangerous requests are allowed.

**Issue**: https://github.com/langchain-ai/langchain/issues/20469

libs/community/langchain_community/agent_toolkits/openapi/planner.py

@@ -3,7 +3,7 @@
 import json
 import re
 from functools import partial
-from typing import Any, Callable, Dict, List, Optional, cast
+from typing import Any, Callable, Dict, List, Literal, Optional, Sequence, cast
 
 import yaml
 from langchain_core.callbacks import BaseCallbackManager
@@ -45,6 +45,8 @@ from langchain_community.utilities.requests import RequestsWrapper
 MAX_RESPONSE_LENGTH = 5000
 """Maximum length of the response to be returned."""
 
+Operation = Literal["GET", "POST", "PUT", "DELETE", "PATCH"]
+
 
 def _get_default_llm_chain(prompt: BasePromptTemplate) -> Any:
     from langchain.chains.llm import LLMChain
@@ -254,25 +256,56 @@ def _create_api_controller_agent(
     requests_wrapper: RequestsWrapper,
     llm: BaseLanguageModel,
     allow_dangerous_requests: bool,
+    allowed_operations: Sequence[Operation],
 ) -> Any:
     from langchain.agents.agent import AgentExecutor
     from langchain.agents.mrkl.base import ZeroShotAgent
     from langchain.chains.llm import LLMChain
 
-    get_llm_chain = LLMChain(llm=llm, prompt=PARSING_GET_PROMPT)
-    post_llm_chain = LLMChain(llm=llm, prompt=PARSING_POST_PROMPT)
-    tools: List[BaseTool] = [
-        RequestsGetToolWithParsing(  # type: ignore[call-arg]
+    tools: List[BaseTool] = []
+    if "GET" in allowed_operations:
+        get_llm_chain = LLMChain(llm=llm, prompt=PARSING_GET_PROMPT)
+        tools.append(
+            RequestsGetToolWithParsing(  # type: ignore[call-arg]
+                requests_wrapper=requests_wrapper,
+                llm_chain=get_llm_chain,
+                allow_dangerous_requests=allow_dangerous_requests,
+            )
+        )
+    if "POST" in allowed_operations:
+        post_llm_chain = LLMChain(llm=llm, prompt=PARSING_POST_PROMPT)
+        tools.append(
+            RequestsPostToolWithParsing(  # type: ignore[call-arg]
+                requests_wrapper=requests_wrapper,
+                llm_chain=post_llm_chain,
+                allow_dangerous_requests=allow_dangerous_requests,
+            )
+        )
+    if "PUT" in allowed_operations:
+        put_llm_chain = LLMChain(llm=llm, prompt=PARSING_PUT_PROMPT)
+        tools.append(
+            RequestsPutToolWithParsing(  # type: ignore[call-arg]
+                requests_wrapper=requests_wrapper,
+                llm_chain=put_llm_chain,
+                allow_dangerous_requests=allow_dangerous_requests,
+            )
+        )
+    if "DELETE" in allowed_operations:
+        delete_llm_chain = LLMChain(llm=llm, prompt=PARSING_DELETE_PROMPT)
+        RequestsDeleteToolWithParsing(  # type: ignore[call-arg]
             requests_wrapper=requests_wrapper,
-            llm_chain=get_llm_chain,
+            llm_chain=delete_llm_chain,
             allow_dangerous_requests=allow_dangerous_requests,
-        ),
-        RequestsPostToolWithParsing(  # type: ignore[call-arg]
+        )
+    if "PATCH" in allowed_operations:
+        patch_llm_chain = LLMChain(llm=llm, prompt=PARSING_PATCH_PROMPT)
+        RequestsPatchToolWithParsing(  # type: ignore[call-arg]
             requests_wrapper=requests_wrapper,
-            llm_chain=post_llm_chain,
+            llm_chain=patch_llm_chain,
             allow_dangerous_requests=allow_dangerous_requests,
-        ),
-    ]
+        )
+    if not tools:
+        raise ValueError("Tools not found")
     prompt = PromptTemplate(
         template=API_CONTROLLER_PROMPT,
         input_variables=["input", "agent_scratchpad"],
@@ -297,6 +330,7 @@ def _create_api_controller_tool(
     requests_wrapper: RequestsWrapper,
     llm: BaseLanguageModel,
     allow_dangerous_requests: bool,
+    allowed_operations: Sequence[Operation],
 ) -> Tool:
     """Expose controller as a tool.
 
@@ -308,7 +342,7 @@ def _create_api_controller_tool(
     base_url = api_spec.servers[0]["url"]  # TODO: do better.
 
     def _create_and_run_api_controller_agent(plan_str: str) -> str:
-        pattern = r"\b(GET|POST|PATCH|DELETE)\s+(/\S+)*"
+        pattern = r"\b(GET|POST|PATCH|DELETE|PUT)\s+(/\S+)*"
         matches = re.findall(pattern, plan_str)
         endpoint_names = [
             "{method} {route}".format(method=method, route=route.split("?")[0])
@@ -326,7 +360,12 @@ def _create_api_controller_tool(
                 raise ValueError(f"{endpoint_name} endpoint does not exist.")
 
         agent = _create_api_controller_agent(
-            base_url, docs_str, requests_wrapper, llm, allow_dangerous_requests
+            base_url,
+            docs_str,
+            requests_wrapper,
+            llm,
+            allow_dangerous_requests,
+            allowed_operations,
         )
         return agent.run(plan_str)
 
@@ -346,6 +385,7 @@ def create_openapi_agent(
     verbose: bool = True,
     agent_executor_kwargs: Optional[Dict[str, Any]] = None,
     allow_dangerous_requests: bool = False,
+    allowed_operations: Sequence[Operation] = ("GET", "POST"),
     **kwargs: Any,
 ) -> Any:
     """Construct an OpenAI API planner and controller for a given spec.
@@ -371,7 +411,11 @@ def create_openapi_agent(
     tools = [
         _create_api_planner_tool(api_spec, llm),
         _create_api_controller_tool(
-            api_spec, requests_wrapper, llm, allow_dangerous_requests
+            api_spec,
+            requests_wrapper,
+            llm,
+            allow_dangerous_requests,
+            allowed_operations,
         ),
     ]
     prompt = PromptTemplate(